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        <div class="span12">
          <h4 id="title">Custom Tiled WMS</h4>
          <p class="tags">
            <span class="badge-group">
              <a
                href="./index.html?q=wms" class="badge badge-info">wms</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="wms"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./wms-custom-proj.html&quot;&gt;Custom Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection.html&quot;&gt;Raster Reprojection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-image.html&quot;&gt;Single Image WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-image-custom-proj.html&quot;&gt;Single Image WMS with Proj4js&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-tiled.html&quot;&gt;Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-tiled-wrap-180.html&quot;&gt;Tiled WMS Wrapping&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-custom-tilegrid-512x256.html&quot;&gt;WMS 512x256 Tiles&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-capabilities.html&quot;&gt;WMS Capabilities Parsing&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-getlegendgraphic.html&quot;&gt;WMS GetLegendGraphic&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-time.html&quot;&gt;WMS Time&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-no-proj.html&quot;&gt;WMS without Projection&lt;/a&gt;"
                tabindex="0"
                >11</a>
            </span>
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              <a
                href="./index.html?q=tile" class="badge badge-info">tile</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="tile"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./wms-custom-proj.html&quot;&gt;Custom Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-wgs84.html&quot;&gt;OpenStreetMap Reprojection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./scaleline-indiana-east.html&quot;&gt;OpenStreetMap Reprojection with ScaleLine Control&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./tile-load-events.html&quot;&gt;Tile Load Events&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./arcgis-tiled.html&quot;&gt;Tiled ArcGIS MapServer&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-tiled.html&quot;&gt;Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-tiled-wrap-180.html&quot;&gt;Tiled WMS Wrapping&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-wfs-geographic.html&quot;&gt;WFS with geographic coordinates&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-custom-tilegrid-512x256.html&quot;&gt;WMS 512x256 Tiles&lt;/a&gt;"
                tabindex="0"
                >9</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=tilelayer" class="badge badge-info">tilelayer</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="tilelayer"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./wms-custom-proj.html&quot;&gt;Custom Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./arcgis-tiled.html&quot;&gt;Tiled ArcGIS MapServer&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-tiled.html&quot;&gt;Tiled WMS&lt;/a&gt;"
                tabindex="0"
                >3</a>
            </span>
            <span class="badge-group">
              <a
                href="./index.html?q=projection" class="badge badge-info">projection</a
              ><a
                class="badge badge-info tag-modal-toggle text-white"
                data-toggle="modal"
                data-target="#tag-example-list"
                data-title="projection"
                data-content="
                  &lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./wms-custom-proj.html&quot;&gt;Custom Tiled WMS&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-image.html&quot;&gt;Image Reprojection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-wgs84.html&quot;&gt;OpenStreetMap Reprojection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./scaleline-indiana-east.html&quot;&gt;OpenStreetMap Reprojection with ScaleLine Control&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./projection-and-scale.html&quot;&gt;Projection and Scale&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection.html&quot;&gt;Raster Reprojection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./reprojection-by-code.html&quot;&gt;Reprojection with EPSG.io Search&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-image-custom-proj.html&quot;&gt;Single Image WMS with Proj4js&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./sphere-mollweide.html&quot;&gt;Sphere Mollweide&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./wms-no-proj.html&quot;&gt;WMS without Projection&lt;/a&gt;
                  &lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./zoomify.html&quot;&gt;Zoomify&lt;/a&gt;"
                tabindex="0"
                >11</a>
            </span>
          </p>
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          <div id="map" class="map"></div>

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        <form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
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        </form>
      </div>

      <div class="row-fluid">
        <div class="span12">
          <p id="shortdesc">Example of using custom coordinate transform functions.</p>
          <div id="docs"><p>With <code>addCoordinateTransforms()</code>, custom coordinate transform functions can be added to configured projections.</p>
</div>
        </div>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">main.js</h5>
        <pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import Map from &#x27;ol/Map&#x27;;
import Projection from &#x27;ol/proj/Projection&#x27;;
import TileLayer from &#x27;ol/layer/Tile&#x27;;
import TileWMS from &#x27;ol/source/TileWMS&#x27;;
import View from &#x27;ol/View&#x27;;
import {ScaleLine, defaults as defaultControls} from &#x27;ol/control&#x27;;
import {
  addCoordinateTransforms,
  addProjection,
  transform,
} from &#x27;ol/proj&#x27;;

// By default OpenLayers does not know about the EPSG:21781 (Swiss) projection.
// So we create a projection instance for EPSG:21781 and pass it to
// ol/proj~addProjection to make it available to the library for lookup by its
// code.

const projection &#x3D; new Projection({
  code: &#x27;EPSG:21781&#x27;,
  // The extent is used to determine zoom level 0. Recommended values for a
  // projection&#x27;s validity extent can be found at https://epsg.io/.
  extent: [485869.5728, 76443.1884, 837076.5648, 299941.7864],
  units: &#x27;m&#x27;,
});
addProjection(projection);

// We also declare EPSG:21781/EPSG:4326 transform functions. These functions
// are necessary for the ScaleLine control and when calling ol/proj~transform
// for setting the view&#x27;s initial center (see below).

addCoordinateTransforms(
  &#x27;EPSG:4326&#x27;,
  projection,
  function (coordinate) {
    return [
      WGStoCHy(coordinate[1], coordinate[0]),
      WGStoCHx(coordinate[1], coordinate[0]),
    ];
  },
  function (coordinate) {
    return [
      CHtoWGSlng(coordinate[0], coordinate[1]),
      CHtoWGSlat(coordinate[0], coordinate[1]),
    ];
  }
);

const extent &#x3D; [420000, 30000, 900000, 350000];
const layers &#x3D; [
  new TileLayer({
    extent: extent,
    source: new TileWMS({
      url: &#x27;https://wms.geo.admin.ch/&#x27;,
      crossOrigin: &#x27;anonymous&#x27;,
      attributions:
        &#x27;© &lt;a href&#x3D;&quot;https://shop.swisstopo.admin.ch/en/products/maps/national/lk1000&quot;&#x27; +
        &#x27;target&#x3D;&quot;_blank&quot;&gt;Pixelmap 1:1000000 / geo.admin.ch&lt;/a&gt;&#x27;,
      params: {
        &#x27;LAYERS&#x27;: &#x27;ch.swisstopo.pixelkarte-farbe-pk1000.noscale&#x27;,
        &#x27;FORMAT&#x27;: &#x27;image/jpeg&#x27;,
      },
      serverType: &#x27;mapserver&#x27;,
    }),
  }),
  new TileLayer({
    extent: extent,
    source: new TileWMS({
      url: &#x27;https://wms.geo.admin.ch/&#x27;,
      crossOrigin: &#x27;anonymous&#x27;,
      attributions:
        &#x27;© &lt;a href&#x3D;&quot;https://www.hydrodaten.admin.ch/en/notes-on-the-flood-alert-maps.html&quot;&#x27; +
        &#x27;target&#x3D;&quot;_blank&quot;&gt;Flood Alert / geo.admin.ch&lt;/a&gt;&#x27;,
      params: {&#x27;LAYERS&#x27;: &#x27;ch.bafu.hydroweb-warnkarte_national&#x27;},
      serverType: &#x27;mapserver&#x27;,
    }),
  }),
];

const map &#x3D; new Map({
  controls: defaultControls().extend([
    new ScaleLine({
      units: &#x27;metric&#x27;,
    }),
  ]),
  layers: layers,
  target: &#x27;map&#x27;,
  view: new View({
    projection: projection,
    center: transform([8.23, 46.86], &#x27;EPSG:4326&#x27;, &#x27;EPSG:21781&#x27;),
    extent: extent,
    zoom: 2,
  }),
});

/*
 * Swiss projection transform functions downloaded from
 * https://www.swisstopo.admin.ch/en/knowledge-facts/surveying-geodesy/reference-systems/map-projections.html
 */

// Convert WGS lat/long (° dec) to CH y
function WGStoCHy(lat, lng) {
  // Converts degrees dec to sex
  lat &#x3D; DECtoSEX(lat);
  lng &#x3D; DECtoSEX(lng);

  // Converts degrees to seconds (sex)
  lat &#x3D; DEGtoSEC(lat);
  lng &#x3D; DEGtoSEC(lng);

  // Axillary values (% Bern)
  const lat_aux &#x3D; (lat - 169028.66) / 10000;
  const lng_aux &#x3D; (lng - 26782.5) / 10000;

  // Process Y
  const y &#x3D;
    600072.37 +
    211455.93 * lng_aux -
    10938.51 * lng_aux * lat_aux -
    0.36 * lng_aux * Math.pow(lat_aux, 2) -
    44.54 * Math.pow(lng_aux, 3);

  return y;
}

// Convert WGS lat/long (° dec) to CH x
function WGStoCHx(lat, lng) {
  // Converts degrees dec to sex
  lat &#x3D; DECtoSEX(lat);
  lng &#x3D; DECtoSEX(lng);

  // Converts degrees to seconds (sex)
  lat &#x3D; DEGtoSEC(lat);
  lng &#x3D; DEGtoSEC(lng);

  // Axillary values (% Bern)
  const lat_aux &#x3D; (lat - 169028.66) / 10000;
  const lng_aux &#x3D; (lng - 26782.5) / 10000;

  // Process X
  const x &#x3D;
    200147.07 +
    308807.95 * lat_aux +
    3745.25 * Math.pow(lng_aux, 2) +
    76.63 * Math.pow(lat_aux, 2) -
    194.56 * Math.pow(lng_aux, 2) * lat_aux +
    119.79 * Math.pow(lat_aux, 3);

  return x;
}

// Convert CH y/x to WGS lat
function CHtoWGSlat(y, x) {
  // Converts military to civil and to unit &#x3D; 1000km
  // Axillary values (% Bern)
  const y_aux &#x3D; (y - 600000) / 1000000;
  const x_aux &#x3D; (x - 200000) / 1000000;

  // Process lat
  let lat &#x3D;
    16.9023892 +
    3.238272 * x_aux -
    0.270978 * Math.pow(y_aux, 2) -
    0.002528 * Math.pow(x_aux, 2) -
    0.0447 * Math.pow(y_aux, 2) * x_aux -
    0.014 * Math.pow(x_aux, 3);

  // Unit 10000&quot; to 1 &quot; and converts seconds to degrees (dec)
  lat &#x3D; (lat * 100) / 36;

  return lat;
}

// Convert CH y/x to WGS long
function CHtoWGSlng(y, x) {
  // Converts military to civil and to unit &#x3D; 1000km
  // Axillary values (% Bern)
  const y_aux &#x3D; (y - 600000) / 1000000;
  const x_aux &#x3D; (x - 200000) / 1000000;

  // Process long
  let lng &#x3D;
    2.6779094 +
    4.728982 * y_aux +
    0.791484 * y_aux * x_aux +
    0.1306 * y_aux * Math.pow(x_aux, 2) -
    0.0436 * Math.pow(y_aux, 3);

  // Unit 10000&quot; to 1 &quot; and converts seconds to degrees (dec)
  lng &#x3D; (lng * 100) / 36;

  return lng;
}

// Convert DEC angle to SEX DMS
function DECtoSEX(angle) {
  // Extract DMS
  const deg &#x3D; parseInt(angle, 10);
  const min &#x3D; parseInt((angle - deg) * 60, 10);
  const sec &#x3D; ((angle - deg) * 60 - min) * 60;

  // Result in degrees sex (dd.mmss)
  return deg + min / 100 + sec / 10000;
}

// Convert Degrees angle to seconds
function DEGtoSEC(angle) {
  // Extract DMS
  const deg &#x3D; parseInt(angle, 10);
  let min &#x3D; parseInt((angle - deg) * 100, 10);
  let sec &#x3D; ((angle - deg) * 100 - min) * 100;

  // Avoid rounding problems with seconds&#x3D;0
  const parts &#x3D; String(angle).split(&#x27;.&#x27;);
  if (parts.length &#x3D;&#x3D; 2 &amp;&amp; parts[1].length &#x3D;&#x3D; 2) {
    min &#x3D; Number(parts[1]);
    sec &#x3D; 0;
  }

  // Result in degrees sex (dd.mmss)
  return sec + min * 60 + deg * 3600;
}
</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">index.html</h5>
        <pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
  &lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;title&gt;Custom Tiled WMS&lt;/title&gt;
    &lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
    &lt;script src="https://unpkg.com/elm-pep@1.0.6/dist/elm-pep.js"&gt;&lt;/script&gt;
    &lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
    &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
    &lt;style&gt;
      .map {
        width: 100%;
        height:400px;
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script src="main.js"&gt;&lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>

      <div class="row-fluid">
        <h5 class="source-heading">package.json</h5>
        <pre><code id="example-pkg-source" class="language-json">{
  &quot;name&quot;: &quot;wms-custom-proj&quot;,
  &quot;dependencies&quot;: {
    &quot;ol&quot;: &quot;6.13.0&quot;
  },
  &quot;devDependencies&quot;: {
    &quot;parcel&quot;: &quot;^2.0.0&quot;
  },
  &quot;scripts&quot;: {
    &quot;start&quot;: &quot;parcel index.html&quot;,
    &quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
  }
}</code></pre>
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